Cutter-head.



A. B. LANDIS. CUTTER HEAD.

MPLIOATIOHTILED Dna. 2.0. 1909.

Patented Feb.20, 1912.

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ATTORNK ...|.IIIHIIHHVI A. B. LANDIS.

OUTTI'IB. HEAD. APPLIoLTmN FILED Dnc. 2o. 1909.

1,017,884. Patent-,ea Feb.20,1912.

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VITNESSES: I Y [NV NTOR. YL.

ABRAHAM B. LANDIS, 0F WAYNESBORO, PENNSYLVANIA.

CUTTER-HEAD.

Specification of Letters Patent.

Patented Feb. 20, 1912.

Application filed December 20, 1909. Serial No. 534,229.

To all whom it may concern:

Be it known that I, ABRAHAM B. LANDIs, a citizen of the United States,residing at Waynesboro, in the county of Franklin and State ofPennsylvania, have invented Certain new and useful Improvements inCutter-Heads, of which the following is a specitication. l

My said invention consist-s in various iinprovements in the details ofconstruction and arrangement of parts of cutter-heads for cuttingthreads on bolts, screws, etc.,said invention relat-ing principally tolthe means for securing the cutter in the cutter-holder, whereby saidcutter may be readily secured in a rigid manner and easily andconveniently released and adjusted, all as will be hereinafter morefully described and claimed.

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts, Figure 1is a front elevation of the cutter-head embodying my said improvements,Fig. 2 a longitudinal section through the same on the dotted line 2 2 inFig. 1, except that part of the rim is shown in elevation, Fig. 3 afront elevation of one of the cutter-heads, separate, Fig. 4 a crosssection on the dotted line 4 4 in Fig. 3, Fig. 5 an underside plan viewof the cutter-holder and cutter as shown in Figs. 3 and 4, and Figs. 5,6, 7, 8 and 9 detail views showing several of the parts separately.

In said drawings the portions marked A represent the body, or frame, ofthe cutterhead, B the cutter-holders and C the cutters.

The body or frame A is, or may be, of any approved construction,preferably of the form more fully illustrated and described in myapplication No. 529,152, filed November 20, 1909. It is formed with thebearings for the cutter-holders located equidistant around a centralaperture and is adapted to be secured to the spindle of the machine inany approved manner. It is provided with a p-art A surrounding the bodyand adapt-ed to have a limited longitudinal movement thereon betweenwhich and the outer ends of the cutter-holders are interposed suitabletoggle pins a.

The construction and operation of the adjusting mechanism for regulatingthe size of the die and for opening and closing A the die may be thesame as shown and described in my above named application, or of anyother construct-ion found appropriate.

The cut-ter-holders B are each of the form best. shown in Figs. 3, 4 and5 and consist of a trunnion adapted to be mounted in one of the bearingsprovided therefor in the body A, said trunnion carrying on it-s forwardend a part B which projects to one side of the axis of said trunnion andis formed with a recessed face to receive the cutter. It is also formedon one side with a bearing b for the inner end of the toggle pin a. Theinner edge of the recess formed to receive the cutter C is formed withan overhanging flange 10 having a face eX- tending at an angle with themain bearing face for the back of the cutter.

The cutter, or Chaser, C is a block of steel of suit-able dimensionsformed with its inner edge adapted to lit under the overhanging iange-10 and is correspondingly tapered. It is formed with a groove 11 in itsface extending longitudinally thereof and adjacent to the tapered edge.The face of said tapered edge is cut back to leave a projecting point 12adjacent to said groove which will serve as the bearing face for thefront of the cut-ter. On its back it is centrally recessed to leavebearing faces 13 and 14 near its edges. The three faces 12, 13. and 14constitute the bearing faces of the cutter against the cutter-holder. Anangle lever 15 is pivoted at its angle on a pivot 16 in a recess in thepart B of the cutterholder adjacent to t-he inner edge thereof. Thelower arm of said lever is of a length to project across the overhangingflange 10 and has an in-turned point 17 which is adap-ted to engagewit-h the longitudinal groove 11 in the cutter. The rear side of saidgroove and the engaging face of said pointare slightly tapered, asshown. Astitf coiled spring 18 is mounted in a recess in the part B',extending at right angles with the recess in which the lever 15 ismounted, its tapered end being adapted to bear against the adjacent edgeof said lever, the tension of said spring being to expand and force theupper end of said lever backward and the lower end with its clamping jawor point 17 upward (when the parts are in the position shown in Fig. 4),or into, the groove 11 against the tapered rear edge thereof, whichoperates to force the tapered edge 0f said cutter back into the recessunder the overhanging flange 10 forcing the tapered face 12 back on theincline and throwing the bearing faces 13 and V14 tightly against themain face of the recess in the cutterholder. Said cutter is also'formedwith a threaded groove g extending longitudinally of its back with whicha screw 20, mounted in a longitudinal perforation in the part El', isadapted to engage. The outer end of said screw 20 is formed with aknurled thumb piece 21 on the outer end of its shank, which extendsbeyond the part B of the cutterholder. Said shank is formed of a smallerdiameter than the part carrying the threads and a neck portion is thusformed between the threaded portion and said knurled portion whichserves as a bearin and turns in a perforation provided there or in thecutter-holder. A handle 22 is mounted in the top of lever 15 andprojects forward to a position convenient to be seized by the hand, asshown in Figs. 3 and 4. By pulling upon the same s ring 18 may becompressed and the point 1 released from engagement with the cutter,permitting said cutter to be adjusted in the way, or recess, by theturning of said screw 20, all as will be readily understood. The innerarm of lever 15 with the engaging point 17 is formed of sufcient widthto afford a firm engagement with said cutter and provide a securesupport therefor.

Under the rules of practice a cross reference is made to my co-pendingapplication No. 529,152.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. A cutter-holder for cutter-heads comprising a body formed with arecess, a chase mounted in said recess and formed with a longitudinalgroove in its face, an angle lever formedv with a projecting pointadapted to engage with said groove and a spring for normally holdingsaid point into engagement with said groove, substantially as set forth.

2. A cutter-head comprising a cutterholder formed with a recess 4toreceive the cutter, the inner edge of said recess being formed with anoverhanging flange with a tapered-inner face, a cutter formed vwith altapered outer face adapted to fit under said overhanging flange, andwith a longitudinal groove adjacent to said face, a spring pressedpivotedlever carrying a clamping jaw'engaging with said groove, andmeans for holding said cutter longitudinally, substantially as setforth.

3. Av V'cutter-head comprising a cutterholde'1formed with a recess toyreceive the cutter, Y' the inner ed e of,s`aidrecess being formed'4 withan over anging tapered flange-,f5-

a cutter mounted in said recess and formed with its outer face taperedto fit under said flange and also formed with a groove adjacent to saidtapered face, a pivoted lever formed with an engaging point adapted'toengage with said groove, a spring for holding said point in engagementwith said groove, and means for disengaging said point, substantially asset forth.

4. A cutter-head comprising a cutterholder formed with a recess toreceive the cutter, said cutter and recess being formed with taperedengaging faces engaging a short distance from the inner edge of saidcutter, another bearing face between the back of the cutter and the mainbearing face of the cutter-holder at its inner corner, and anotherbearing face between the cutter and the cutter-holder at its outercorner, and means for holding said cutter in position, substantially asset forth.

5. A cutter head comprising a cutterholder formed with a recess for thecutter, a cutter mounted in said recess, said cutter and cutter-holderbeing formed to have three bearing faces two of which are at the outercorners on the back of said cutter and one of which is between anoverhanging ange on the holder and a bearing face on the face of saidcutter at a point inside of the bearing face on the back of said cutter,substantially as set forth.

6. A cutter for thread 'formin cutterheads formed with three bearingaces two of which are on its back and adjacent to its outer corners andthe other of which is on its front adjacent to the cutting grooves andbetween its outer edges, substantially asset forth.

7. A cutter for thread forming cutterheads having thread forming grooveson its face,'a beveled surface on its face adjacent to its inner edge,and a clamp groove in its ABRAHAM B. LANDIs. [1.. 8.]

Witnesses:

E. W. BRADFORD,

L. A. PRICE.

Clopi-es o-fthis patent may b obtained for ve cents each, by addressingthe Commissioner of latents,

Washington, D. G.

